Fluid-pressure system



V Aug. 5, 1924. 1,5o3,ss9

- W; J. FENDNER ELUID PREssuRE SYSTEM Filed Sept. 9 1920 3 Sheets-Sheet5 l to:

"i lllII-IIIIIIIII s i wmvessfe; I Q VU Ng/'ENTOR 44W Patented Aug. 15E1924.

UNITED STAT-Es.

PATENT OFFICE.

WILLARD J'. FENDNER, OfE IPITTSBURGH, PENNSYLVANIA, ASSIGN'OR TO CLAEKCAR COMIBANY, A COEPORA'I'IQN OF PENNSYLVA'N'IA.

i FLUID-PRESSURE SYSTEM.

Application med september 9, 1920. serm No. 409,192.

To aZZfwhomitmay-ooncem:

Be it known that I, WILLARD J. FENDNER, a citizen of the United States,and a resi- V dent of Pittsburgh, in the county of Alleghenyv and Stateof Pennsylvania, have made a new and useful Improvement inFluid-Pressure Systems, of which the following is a specification. vi

My invention relates to railroad rolling stock and in particular to dumpcars operated by -fluid pressure such as compressed air. The mechanismby which the car doors are secured and operated and the car dumped mayvary and those familiar with the art are aware of the multitude ofdumping mechanisms now in existence. The particular mechanism used isunimportant as my invention consists in the fluid pressure controlsystem. I refer to U. S. Letters Patent No. 1,333,293, Clark et al.,March 9,1920, for a detailed disclosure of a tilting body dumpv carprovided with side doors hinged near the body fioor and in which thebody is released' from an upright position and tilted to one side andthe doors on that side opened to dump the load. The body is subsequentlyreturned to and secured in upright position and the doors closed. All of'these operations are performed automatically by control of compressedair.-`

My system disclosed herein has been applied to a car of the above typeand in the drawing. accompanying this specification and forming partthereof the arrangement of the piping and apparatus is adapted for sucha car which car is indicated in part by dot and dash lines.

Figure 1 is a side elevation of thesystem in place on the car; Fig. 2 isan elevation, on a larger'scale, of either end of the car and as much ofthe 'system as is located thereon; Fig. 3 is an enlarged side elevationadjacent the transvers center line of the car; Fig. 4 is a plan o theapparatus and piping shown -in Fig. 3; Fig. 5 is a view on line 5-5 ofFigs. 1 and 3 and showing a part of the 1body and door controlImechamsm; Fig. 6l is a view on line 6-6 of Fig. 4, and Fig. 7 is a sideelevation of apparatus and piping omitted from Fig. 1 to more clearlydisclose parts located in the rear thereof. Fig. 8 is a sectional viewillustrating a valve and valve-operating mechanism such as disclosed andclaimed in usual trucksand has upstanding ends B between which, andtiltingly mounted on the underframe,'is the body O. The sides of the carare formedof doors D which are so lunged to the underframe and body thattiltlng of the body to one side swings the doors on that side to an openposition where they form an extension of the car floor. The body isnormally locked in an upright position and when the car is to be umped,it is first necessary to release the door latchin th dumping position.

The looking mechanism on the left hand side of the body is mounted ond alooking shaft E (Fig. 5) and is released 'by rotation of the shaft in aclockwise direction. The

body is then tilted 'to the. right 'by being` pushed sideways at both ofits ends. This rotation of shaft-E and the pushing of the body isaccomplished by the following apparatus:

A reservoir tank 1 is mounted 'on the underframe A and is supplied withair by the thru train line supply line 2 thru a union T 3, a connectinpipe 4, having a dust collector 5, (Fig. g) a check valve 6 and acut-out cock 7 and entering the reservoir 1 thru a union T Sand a branch9. A latch operating cylinder 10 is mounted on underframe A between theunderframe sills and displacement of its piston 11 (Fig. 5), thru leversF and G, rotates latching Shaft E. To operate cylinder 10, air passesfrom reservoir 1 thru a car operating line 12 (Figs. 1 and 2) to valve13, from where it is controlled manually, to piping 14 which unites witha thru train operating line 15 leading thru a unionHT 16 (Fi (fl) and acut-out cock 17 to the latch sha t operating cylinder 10. Valve 13 iscontrolled by a handle 24.

When piston 11 has been thrust to its lowermost position, it hasoperated to release the latch mechanism and it uncovers a port 18 in thewall of cylinder 10 which leads thru piping 18 to a reservoir operatingvalve 19' (described and claimed inUnited States patent to Clark, No.1,373,599 of April 5, 1921, which is thereby automatically openedpermitting the air in reservoir .1' to pass thru piping 20 directlytoboth mechanism and to then tilt the body to ends of the'car where it isadmitted, thru a relief valve 21 (forming -the subject matter of acopending application,` Serial No. 345,669, Clark et al., 1919,) to thebody tilting cylinders 22.

'. These cylindersv are pivotally mounted upon piping '14 with anatmospheric-exhaust or' dump cylinders.

the air in 'the thru train operatin lme 15 'is exhausted at a remotepoint by e operator) and the action of spring H raises piston 11.' f Thesupply of operating air thru port 18El being4 terminated, and the risingpiston 1-1 reducing the pressure in line 18, 'valve 19 automaticallycloses the passage from reservoir 1 to pipe 20 and opens an exhaust port25 which permits the operating cylinders to-exhaust therethru and theirpistons telescope and the car body'is returned to upright position bythe relative position of the center ofgravity andV the pivotal point ofsupport on the underframe as disclosed in co-pending application SerialNo. 256,130, Clark, filed September 28, 1918.

The valve 19 and its 'operating mechanism isdi'sclosed in Fig. 8. Asthere shown; the valve proper controls the delivery of actuating fiuidthrough the ports a and b, the port a: communicating -witli the sourceof fiuid pressure and the port b With the The valve casing is formedintegrally with a valve-operating cylinder in which a difl'erentialpiston d is located.

This cylinder is provided with the exhaust' port 25 which is so locatedthat the port b is iii open communication with the port 25 when thepiston d is. in such a position that the valve 19 is closed. The lowerend of the cylinder is provided with a port e which communicates withthe latch-operating cylinder 10 through the piping 18. Valve. 19 isprovided with 'a spring for holding it to its seat and the piston d isprovided with a spring for assisting the valve-closing movement of thepiston. 1

To tilt'the heavy body requires a large amount of work. This requirementis accentuated by the uneven path of travel for the body on theunderframe, as detailed in application Serial No. 256,130, Clark, filedSeptember 28, 1918, which creates a peak load on cylinder 22 at theJbeginning of its movement. To carry this load and to provide forthe-large piston displacement and to Vavoid exc'essive friction inconnecting piping and 'abnormally large air pressure in reservoir 1, arelatively large piping from the. reservoir to ;fbylinders 22 ..isnecessary compared with thtrequired for'cylinder 10 and valve 19. `filedDecember 17 1 To use the samef'piping'- for cylinders 22 and forcylinder 10-:meanf's either a too violent thrust and 'sudden stoppingo'f'vpistoni.

11 in cylinder 10 andthe'mechanism operatedI thereby with destructionof: piston Vpacking, bearings and-high air friction, or,

a slow, ineflicient'operation of cylinders 22 and the car body, if'operated atl all'. My

construction avoids 'these difliculties 'while utiliz'ing theadvantagesof a single manual control of the operating line andVautomatic control of thecar dumpingmechanism; Th

piping arrangement. shown enables me to install any appropriate sizeofpipe for the -control line 'and any different size pipe de-" sired forthe operating line; T-his arrangement could not' be followed with anypreviously used system with which I am familiar. v

I claim V 1. In combination With a tilting body dump car having Va latchoperating mechanism for looking the body in' a'n upright position,a-dump cylinder operatively 'connected to the body, a latchv operatingcylinder having an inlet port and a piston controlled fiuid deliveryport, a pistonV operating therein and operatively coupled to rthe latchoperating mechanism, a' source of fiuid pressure, an automatic valve forcontrolling delivery of fiuid' from said source toI said dump cylinderand for exhaustingsaid dump cylinder, a valve operating cylinderconnected to thedelivery port of said latch 'operating cylinder, a valveoperatingpiston located in said valve operating cylinderl for actuatingsaid automatic valve, anda manually operated valve for controlling thedelivery of fiuid from said source to said latch operating cylinder andthe exhaust of fiuid 'from said latch operating cylinder.

2. In combination with the tilting body' of a dump car and the-latchoperating mechanism for holding 'thebody in an upright position, alatch' operating cylinder having a combined inlet and' discharge port,and a piston controlled fluid'delivery port, a dump cylinder lhavin acombined fiuid inlet and 'discharge por a. source of fiuid i :locatedtherein for operating said automatic valve, and a. manually Voperatedvalve for controllingthe delivery -ofoperatin fiuid to and thedischai'geofoperating flui from the combined inlet and discharge port ofsaid latch operating cylinder.

3. In combination with the tilting body of a dump car having alatch-operating mechanism for looking the'body in an up- 'i eryv port, apiston operating in said cylinder to open and close said delivery port,a source of fluid under pressure, a manually-controlled valve fordelivering fluid uiider pressure to said latch cylinder, a separate'valve for establishing and cutting oil' direct communication betweensaid sourceof pressure and said dump cylinder, a co-operating Vcylinderand pistonfor actuating said valve and for controllin the exhaust ofoperatingfluid from sai cylinder, and means for delivering fluid fromsaid latch-operating cylinder to operate said last-mentioned piston. 1

4. In combination With the tiltin body of a dump car, a latch-operatingmec anism for looking the body an upright position, `a dump cylinderoperatively coupled to the body, a latchfoperating cylinder having apiston-controlled fluid-delivery port, a fluid responsive piston locatedWithin vsaid cylinder for Controlling the delivery of fluid through saidport, a source of fluid under pressure, a manually-controlled 'valve forControlling the deliveryof fluid from said source to said cylinder andthe discharge of fluid from said cylinder and a separate valve mechanismresponsive to ;variations in fluid pressure Within said latch cylinderfor' establishing and cutting ofldirect communication between saidsource of pressure and said dump 'cylinder 'and` for enhausting said.

dump[ cylinder. V

, 5. n combination with the tilting body of a dump car, a dump cylinderoperatively coupled to said body, a source of fluid under pressure, anautomatic valve for Controlling the delivery of fluid from said sourceto said cylinder and the discharge offiuid from said cylinder, a.valve-operating cylinder, a fitii'd-pressure-actuated valve-operatingpiston` located in said cylinder, a second cylinder of greatervolumetric capacity than said valve operating cylinder and having apiston-controlled port formed' therein for establishing communicationWith said valveoperatin cylinder, a fluid pressure controlled plstonoperating within said second cylinder for controlling said portl toadmit fluid under pressure to said valve-operating cvlinder and forreducing the pressure vwvithin said valve-operating cylinder while'moving in response to a reductionin fluid pressure, and a manuallycontrolled valve for Controlling the delivery of fluid from said sourceto said second cylinder.

In jtestimony Whereof,.I have hereunto subscribed my name 31st day ofAugust, 1920.

WILLARD J. FENDNER'.

